<script setup>
import { User, Lock } from '@element-plus/icons-vue'
import { ref, watch } from 'vue'
import { registerAPI, loginAPI } from '@/api/user'
import { useUserStore } from '@/stores/index.js'
import { useRouter } from 'vue-router'

const userStore = useUserStore()
const router = useRouter()
// 登录注册切换
const isRegister = ref(false)
// 获取表单元素
const formRef = ref(null)

// 校验注册表单逻辑
// 整个用于提交的数据对象 (需要响应式)
const formModel = ref({
  username: '',
  password: '',
  repassword: ''
})
// 整个表单的校验规则 (不需要响应式)
// 1. 非空校验  2. 长度校验  3. 正则校验  4. 自定义校验
const rules = {
  username: [
    { required: true, message: '请输入用户名', trigger: 'blur' },
    {
      min: 3,
      max: 10,
      message: '用户名必须是 3 到 10 位的字符',
      trigger: 'blur'
    }
  ],
  password: [
    { required: true, message: '请输入密码', trigger: 'blur' },
    {
      pattern: /^\S{6,15}$/,
      message: '密码必须是 6 到 15 位的非空字符',
      trigger: 'blur'
    }
  ],
  repassword: [
    { required: true, message: '请再次输入密码', trigger: 'blur' },
    {
      pattern: /^\S{6,15}$/,
      message: '重复密码必须是 6 到 15 位的非空字符',
      trigger: 'blur'
    },
    // 自定义校验 两次密码必须一致
    // validator: 验证的函数   value: 表单的值   rules: 表单的校验规则
    // callback: 回调函数  callback()成功    callback(new Error()) 失败  无论成功还是失败 都要回调
    {
      validator: (rule, value, callback) => {
        if (value !== formModel.value.password) {
          callback(new Error('两次输入的密码不一致'))
        } else {
          callback() // 成功也需要回调
        }
      },
      trigger: 'blur' //失焦 触发
    }
  ]
}

// 点击注册
const register = async () => {
  // 注册成功之前 进行表单的预校验
  await formRef.value.validate()
  // 注册接口
  const { data } = await registerAPI(formModel.value)
  // 提示用户
  ElMessage.success(data.message)
  // 切换到登录
  isRegister.value = false
}

// 点击登录
const login = async () => {
  // 注册成功之前 进行表单的预校验
  await formRef.value.validate()
  // 登录接口
  const { data } = await loginAPI(formModel.value)
  // 存储 token
  userStore.setToken(data.token)
  // 提示用户
  ElMessage.success(data.message)
  // 跳转到首页
  router.push('/')
}

// 切换 登录和注册 的时候 重置表单内容
watch(isRegister, () => {
  formModel.value = {
    username: '',
    password: '',
    repassword: ''
  }
})
</script>

<template>
  <el-row class="login-page">
    <el-col :span="12" class="bg"></el-col>
    <el-col :span="6" :offset="3" class="form">
      <!-- 注册表单 -->
      <el-form
        :model="formModel"
        :rules="rules"
        ref="formRef"
        size="large"
        autocomplete="off"
        v-if="isRegister"
      >
        <el-form-item>
          <h1>注册</h1>
        </el-form-item>
        <el-form-item prop="username">
          <el-input
            v-model="formModel.username"
            :prefix-icon="User"
            placeholder="请输入用户名"
          ></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input
            v-model="formModel.password"
            :prefix-icon="Lock"
            type="password"
            placeholder="请输入密码"
            start-icon
          ></el-input>
        </el-form-item>
        <el-form-item prop="repassword">
          <el-input
            v-model="formModel.repassword"
            :prefix-icon="Lock"
            type="password"
            placeholder="请输入再次密码"
            start-icon
          ></el-input>
        </el-form-item>
        <el-form-item>
          <el-button
            class="button"
            type="primary"
            auto-insert-space
            @click="register"
          >
            注册
          </el-button>
        </el-form-item>
        <el-form-item class="flex">
          <el-link type="info" :underline="false" @click="isRegister = false">
            ← 返回
          </el-link>
        </el-form-item>
      </el-form>

      <!-- 登录表单 -->
      <el-form
        ref="formRef"
        size="large"
        autocomplete="off"
        :model="formModel"
        :rules="rules"
        v-else
      >
        <el-form-item>
          <h1>登录</h1>
        </el-form-item>
        <el-form-item prop="username">
          <el-input
            :prefix-icon="User"
            placeholder="请输入用户名"
            v-model="formModel.username"
          ></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input
            v-model="formModel.password"
            name="password"
            :prefix-icon="Lock"
            type="password"
            placeholder="请输入密码"
          ></el-input>
        </el-form-item>
        <el-form-item class="flex">
          <div class="flex">
            <el-checkbox>记住我</el-checkbox>
            <el-link type="primary" :underline="false">忘记密码？</el-link>
          </div>
        </el-form-item>
        <el-form-item>
          <el-button
            class="button"
            type="primary"
            auto-insert-space
            @click="login"
            >登录</el-button
          >
        </el-form-item>
        <el-form-item class="flex">
          <el-link type="info" :underline="false" @click="isRegister = true">
            注册 →
          </el-link>
        </el-form-item>
      </el-form>
    </el-col>
  </el-row>
</template>

<style lang="scss" scoped>
.login-page {
  height: 100vh;
  background-color: #fff;
  .bg {
    background:
      url('@/assets/logo2.png') no-repeat 60% center / 240px auto,
      url('@/assets/login_bg.jpg') no-repeat center / cover;
    border-radius: 0 20px 20px 0;
  }
  .form {
    display: flex;
    flex-direction: column;
    justify-content: center;
    user-select: none;
    .title {
      margin: 0 auto;
    }
    .button {
      width: 100%;
    }
    .flex {
      width: 100%;
      display: flex;
      justify-content: space-between;
    }
  }
}
</style>
